31031130 has 64 divisors (see below), whose sum is σ = 80777088. Its totient is φ = 7584000.

The previous prime is 31031083. The next prime is 31031201. The reversal of 31031130 is 3113013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97732 + ... + 98048.

It is an arithmetic number, because the mean of its divisors is an integer number (1262142).

Almost surely, 2^31031130 is an apocalyptic number.

31031130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31031130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40388544).

31031130 is an abundant number, since it is smaller than the sum of its proper divisors (49745958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31031130 is a wasteful number, since it uses less digits than its factorization.

31031130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591.

The product of its (nonzero) digits is 27, while the sum is 12.

The square root of 31031130 is about 5570.5592178883. The cubic root of 31031130 is about 314.2431818673.

Adding to 31031130 its reverse (3113013), we get a palindrome (34144143).

The spelling of 31031130 in words is "thirty-one million, thirty-one thousand, one hundred thirty".